I've been searching and reading up on this running a Shimano wheelset and 9s cassette on a Campy 9s drivetrain thing. Every thread I found says you need a Shimano compatible chain as well. Why is this? I basically want to be able to switch between a Shimano wheel and a Campy wheel at my leisure, so why won't my Campy chain work with the Shimano cassette? Hopefully, the answer is it will work, because then I can get a $40 Ultegra 28H hub and $30 105 cassette. If I have to stick with Campy, the best I can find in a 28H is a record hub for $160! That negates my motive for a budget but lightweight wheel build.